Can the line out be used for a powered subwoofer?

Yes. I have separate RCA outs going into a powered subwoofer. The other RCA out is routed to a power amplifier. If I remember correctly, I may have used a small, passive RCA mixer for additional routing options.

If paired with power amp which unit controls the volume ?

This T8 tube preamplifier only the main volume control, without the bass treble adjust , so you can check your require to order it,more detail can email(Sandy@aiyima.com),we can suggest you.Thanks

Can someone please tell me where to buy GE5657 vacuum tube?

You can purchase it on your locally,or other platforms, we do not sell tubes separately, thank you for your understanding

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Tube Headphone Amp

Product ID: 274766215

Details

Brand
AIYIMA
Item dimensions L x W x H
4.84 x 1.97 x
Manufacturer
YIMA TECH
Maximum Supply Voltage
12
Minimum Supply Voltage
12

🎧Supports 16-300Ω headphones impedance

💡6N3 vacuum tube for warm, vintage sound

🔊Bluetooth 5.0 with aptX lossless audio

€ 225.34

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Description

🎶 Elevate your sound game with vintage warmth and modern wireless freedom!

TAILORED SOUND CONTROL - Independent bass and treble gain adjustments let you sculpt your perfect sonic signature.
UNIVERSAL HEADPHONE COMPATIBILITY - Optimized for headphones from 16Ω to 300Ω, ensuring premium sound for every listening style.
SEAMLESS MULTI SOURCE CONNECTIVITY - Bluetooth 5.0, PC-USB, RCA, and optical inputs keep your audio ecosystem effortlessly connected.
WARM ANALOG VIBES WITH MODERN PRECISION - 6N3 vacuum tube delivers rich, smooth sound with customizable tube swapping for true audiophile DIY.
SLEEK DURABLE DESIGN WITH SMART DISPLAY - All-aluminum alloy chassis with OLED display and remote control for intuitive, stylish operation.

The AIYIMA T8 6N3 Digital Tube Preamplifier combines classic vacuum tube warmth with cutting-edge Bluetooth 5.0 aptX lossless streaming, supporting multiple inputs including PC-USB and RCA. Designed for audiophiles and professionals, it offers precise bass and treble control, supports headphones from 16Ω to 300Ω, and features a durable aluminum build with an intuitive OLED display and remote control. Perfect for anyone seeking a premium HiFi experience with versatile connectivity and customizable sound.

Specifications

ASIN	B08RHL17JK
Best Sellers Rank	#184,335 in Electronics ( See Top 100 in Electronics ) #97 in Audio Component Preamplifiers
Brand Name	AIYIMA
Customer Reviews	4.4 4.4 out of 5 stars (259)
Included Components	1 pc T8; 1pc DC 12V adapter
Item Dimensions	4.84 x 1.97 x 5.47 inches
Item Highlight	Hi-Fi Headphone Preamp, Decoder Preamp, PC-USB DAC,for Home Wireless Receiver Audio Stereo Amplifier, with Remote Control
Manufacturer	YIMA TECH
Material Type	Aluminum
Maximum Supply Voltage	12 volts_of_direct_current
Minimum Supply Voltage	12 volts_of_direct_current
Model	B2D2518A
Number of Channels	2
Number of Items	1
Number of Packs	1
Part Number	T8
UPC	711731345383
Unit Count	1 Count
Warranty Description	AIYIMA brand products provide one-year warranty and after-sales service, please consult for details:www.amazon.com/hz/help/contact/A3BG62S1F23IH5#

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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€ 225.34

Duties & taxes included

In stock

Sold byAmazon GERMANYDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to GERMANY.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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